On 2/14/10 7:02 PM, zfs ml wrote:
On 2/14/10 4:12 PM, Kjetil Torgrim Homme wrote:
Bogdan Ćulibrk<b...@default.rs> writes:
What are my options from here? To move onto zvol with greater
blocksize? 64k? 128k? Or I will get into another trouble going that
way when I have small reads coming from domU (ext3 with default
blocksize of 4k)?
yes, definitely. have you considered using NFS rather than zvols for
the data filesystems? (keep zvol for the domU software.)
it's strange that you see so much write activity during backup -- I'd
expect that to do just reads... what's going on at the domU?
Most likely the cause of the whole problem - not having noatime set for
all domU and dom0 filesystems. During backups of the domUs you will be
constantly thrashing doing writes to all your metadata for nothing.
On the dom0, if you don't have noatime on, you are constantly updating
the metadata for the domU backing store, since they generally have some
read traffic all the time.
sorry, scratch the above - I didn't see this:
9. domUs have ext3 mounted with: noatime,commit=120
Is the write traffic because you backing up to the same disks that the domUs
live on?
_______________________________________________
zfs-discuss mailing list
zfs-discuss@opensolaris.org
http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
